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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Related Party Transaction [Line Items]          
Due from related parties $ 64   $ 64   $ 17
Revenue from related parties 7 $ 1 11 $ 2  
Transportation and Fuel Management Agreement [Member]          
Related Party Transaction [Line Items]          
Revenue from related parties 6 2 10 3  
NextEra Energy, Inc. [Member] | Management Services Agreement [Member]          
Related Party Transaction [Line Items]          
Expenses from transactions with related party (27) (23) (53) (44)  
NEER [Member] | Cash Sweep and Credit Support Agreement [Member]          
Related Party Transaction [Line Items]          
Interest expense (1) $ (1) (3) $ (3)  
Due from related parties 58   $ 58   $ 12
NEP OpCo [Member] | NextEra Energy, Inc. [Member] | Management Services Agreement [Member]          
Related Party Transaction [Line Items]          
Management fee, percent of EBITDA     1.00%    
Annual management fee     $ 4    
Related Party Transaction, Additional Management Fee, Threshold, Prior Year EBITDA     4    
NEER [Member] | Guarantees [Member]          
Related Party Transaction [Line Items]          
Related party obligations 11   11    
NextEra Energy Capital Holdings [Member] | Guarantees and Letters of Credit [Member]          
Related Party Transaction [Line Items]          
Total amount of letters of credit $ 639   $ 639